The NDT section of our company is involved in all aspect of non-destructive test and radiographic inspection both on off-shore and land operations.
The peculiarity of the material to be inspected is put into cognisance on type of inspection to be carried out. Our standard for the inspection of Oil Country tubular Goods (OCTG) are in conformity with API.
Some of the inspection carried out involves the following:
1) Magnetic Particle Inspection - MPI
2) Dye Penetrant Inspection
3)Lifting Equipment Inspection and Testing
4) Visual Inspection
5) Wall Thickness Spot Test - Ultrasonic Wave Technique
6) Spectro-Flux Inspection
7) O.D. Inspection of Tool Joints
8) Radiographic interpretation of results on all equipment and structural welds.
9) Drift Test of Casing
11) External and Internal Cleaning and Preservation.
12) Corrosion Monitoring
13) Electro-magnetic Inspection - EMI
Magnetic Particle Inspection (MPI)MPI is a proven and reliable method of detecting even the smallest surface, or near-surface, flaws in ferrous materials.
The MPI inspection equipment establishes the magnetic field pattern of the material and pinpoints cracks by identifying any distortion in that field. Cracks cause leakage of magnetic flux in the vicinity of the flaw and the equipment identifies build-ups of very fine iron particles that gather at the location of the leakage, however small it may be.
Dye Penetrant Inspection (DPI:) DPI is a simple method of detecting surface-extruding flaws such as cracks or porosity. One step up from visual inspection, DPI offers advantages of large area coverage, speed and low cost.
Based on the principle that liquid is drawn into a surface-breaking crack by capillary action, dry powder developer is applied to the surface to draw out the liquid that has penetrated the crack and produce a surface indication.
Eddy Current Inspection: Eddy Current Inspection is used to detect surface- exuding defects such as fatigue without having to remove protective coatings by grit blasting or needle gun. Green-edge has successfully applied this technique in the offshore industry .
Ultrasonic Inspection: This effective method produces quick, highly sensitive results and can be used on most materials if sound transmission is good. High frequency sound pulses are emitted from a transducer above a sample of the material.
The sound waves propagate through the sample, reflecting at interfaces and these reflected waves are monitored by a detector above the sample. The depth and type of flaws are ascertained using this method. The testing is carried out from one side of the sample only.